Vezi ca s-a pus un link mai devreme aici: http://forums.bimmerforums.com/forum/showthread.php?30479-why-does-bmw-suggest-0w40-or-5w40-motor-oil&p=249064#post249064 The bottom line is this. The lower the first number is for engine oils, the better it is for your engine in order to reduce initial start up engine wear. And it has been proven in independent studies that approximately 90% of engine wear occurs at the time you initially crank a cold engine! And a cold engine is defined as an engine that hasn't been cranked in a few hours...even though it may be sitting in the hot sun on a 120 degree day! Most all car makers are now recommending 5W-** or 0W-** engine oils for their car's engines. You will see more and more oil makers producing 0W-** engine oils soon. They just need to educate the buying public why 0W-** engines oils are better regardless of climate. Better yet, they need to change the way they grade engine oils (and "gear" oils too) so it makes more sense to the average car owner...